/**
 * 
 * 
 */
package com.example.cloudcommon.util;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.stereotype.Component;

import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * @author: todd
 * @date:   2023年8月23日
 */

@Component
public class RedisCacheUtil {

	public Gson gson = new GsonBuilder().create();

	@Autowired
    public RedisTemplate redisTemplate;

    /**
     * 缓存基本对象
     *
     * @param key   键
     * @param value 值
     */
    public <T> void setCacheObject(final String key, final T value) {
        redisTemplate.opsForValue().set(key, value);
    }

    public <T> void batchSetCacheObject(final Map<String, T> dataMap) {
        redisTemplate.opsForValue().multiSet(dataMap);
    }

    /**
     * 缓存基本对象，含有效时间
     *
     * @param key     键
     * @param value   值
     * @param timeout 超时时间
     */
    public <T> void setCacheObject(final String key, final T value, final Long timeout, TimeUnit timeUnit) {
        redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
    }

    /**
     * 缓存List数据
     *
     * @param key      键
     * @param dataList 数据列表
     */
    public <T> long setCacheList(final String key, final List<T> dataList) {
        Long count = redisTemplate.opsForList().rightPushAll(key, dataList);
        return count == null ? 0 : count;
    }

    public <T> long setCacheList(final String key, final T data) {
        Long count = redisTemplate.opsForList().rightPush(key, data);
        return count == null ? 0 : count;
    }

    /**
     * 缓存Set数据
     *
     * @param key     键
     * @param dataSet 数据集合
     */
    public <T> BoundSetOperations<String, T> setCacheSet(final String key, final Set<T> dataSet) {
        BoundSetOperations<String, T> setOperation = redisTemplate.boundSetOps(key);
        Iterator<T> it = dataSet.iterator();
        while (it.hasNext()) {
            setOperation.add(it.next());
        }
        return setOperation;
    }

    /**
     * 缓存Map数据
     *
     * @param key     键
     * @param dataMap 数据键值对
     */
    public <T> void setCacheMap(final String key, final Map<String, T> dataMap) {
        if (dataMap != null) {
            redisTemplate.opsForHash().putAll(key, dataMap);
        }
    }

    /**
     * 缓存Hash数据
     *
     * @param key     键
     * @param hashKey hash值
     * @param value   值
     */
    public <T> void setCacheMapValue(final String key, final String hashKey, final T value) {
        redisTemplate.opsForHash().put(key, hashKey, value);
    }

    /**
     * 设置有效时间，以秒为单位
     *
     * @param key     键
     * @param timeout 超时时间
     * @return true=有效；false=失效
     */
    public boolean expire(final String key, final long timeout) {
        return expire(key, timeout, TimeUnit.SECONDS);
    }

    /**
     * 设置有效时间，自定义单位
     *
     * @param key     键
     * @param timeout 超时时间
     * @param unit    时间单位
     * @return true=有效；false=失效
     */
    public boolean expire(final String key, final Long timeout, final TimeUnit unit) {
        return redisTemplate.expire(key, timeout, unit);
    }

    /**
     * 删除单个对象
     *
     * @param key 键
     */
    public boolean deleteObject(final String key) {
        return redisTemplate.delete(key);
    }

    /**
     * 删除集合对象
     *
     * @param collection 多个对象
     */
    public long deleteObjects(final Collection collection) {
        return redisTemplate.delete(collection);
    }

    /**
     * 删除Hash数据
     *
     * @param key     键
     * @param hashKey hash
     */
    public void delCacheHashValue(final String key, final String hashKey) {
        HashOperations hashOperations = redisTemplate.opsForHash();
        hashOperations.delete(key, hashKey);
    }


    /**
     * 获取基本对象数据
     *
     * @param key 键
     */
    public <T> T getCacheObject(final String key) {
        ValueOperations<String, T> operation = redisTemplate.opsForValue();
        return operation.get(key);
    }

    public <T> T getNoDb(String key, Class<T> cls) {
        return gson.fromJson(gson.toJson(redisTemplate.opsForValue().get(key)), cls);
    }

    public <T> T get(String key,
                     Class<T> clazz,
                     DbQueryFunction<T> dbQueryFunction,
                     long expireTime) {
        // 1. 尝试从Redis获取数据
        T result = (T) redisTemplate.opsForValue().get(key);

        if (result != null) {
            return result; // 缓存命中直接返回
        }

        // 2. 缓存未命中，查询数据库
        if (dbQueryFunction != null){
            result = dbQueryFunction.queryFromDb();

            if (result != null) {
                // 3. 数据库查询到结果，存入Redis
                if(expireTime > 0){
                    redisTemplate.opsForValue().set(key, result, expireTime, TimeUnit.MINUTES);
                }else{
                    redisTemplate.opsForValue().set(key, result);
                }
            }
        }

        return result;
    }

    /**
     * 获取List数据
     *
     * @param key 键
     */
    public <T> List<T> getCacheList(final String key) {
        return redisTemplate.opsForList().range(key, 0, -1);
    }

    public <T> List<T> getCacheList(final String key, final int pageNum, final int pageSize) {
        int start = pageSize * (pageNum - 1);
        int end = start + pageSize - 1;
        return redisTemplate.opsForList().range(key, start, end);
    }

    /**
     * 获取Set数据
     *
     * @param key 键
     */
    public <T> Set<T> getCacheSet(final String key) {
        return redisTemplate.opsForSet().members(key);
    }

    /**
     * 获取Map数据
     *
     * @param key 键
     */
    public <T> Map<String, T> getCacheMap(final String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * 获取Hash对象数据
     *
     * @param key     键
     * @param hashKey hash
     */
    public <T> T getCacheHashValue(final String key, final String hashKey) {
        HashOperations<String, String, T> opsForHash = redisTemplate.opsForHash();
        return opsForHash.get(key, hashKey);
    }

    /**
     * 获取多个Hash对象数据
     *
     * @param key      键
     * @param hashKeys hash数组
     */
    public <T> List<T> getMultiCacheHashValue(final String key, final Collection<Object> hashKeys) {
        return redisTemplate.opsForHash().multiGet(key, hashKeys);
    }

    /**
     * 判断key是否存在
     *
     * @param key 键
     */
    public boolean exist(String key) {
        return redisTemplate.hasKey(key);
    }


    /**
     * 获取key模糊查询
     *
     * @param key 键
     */
    public Set<String> likeKey(String key) {
        Set<String> keys = redisTemplate.keys(key);
        return keys;
    }


    /**
     * 向stream中插入数据
     *
     * @param key   键
     * @param value jsonstring
     */
    public void setStreamValue(String key, Map<String, Object> value) {
        redisTemplate.opsForStream().add(key, value);
    }


    @FunctionalInterface
    public interface DbQueryFunction<T> {
        T queryFromDb();
    }

}